On PHP’s MD5() documentation page, tszming at gmail dot com states by calling MD5() with raw_output option turned on and call bin2hex() function to convert it to hexadecimal is 3 times faster than using just MD5() function.
This sounds stupidly impossible, surely by calling one pre-built function should be faster than calling two pre-built functions with same functionality. But tszming is right, calling MD5 along is slower than calling bin2hex(md5()).
This is my test.
First test will create 1000 randomly generated string (ASCII 0 to 250). The test array of strings will be passed to the two functions to measure the time it takes to complete the operation.
Result:
|
Test 1 |
Test 2 |
Test 3 |
Test 4 |
Test 5 |
Average |
| SimpleMD5 |
7.05 ms |
6.91 ms |
6.76 ms |
6.74 ms |
6.70 ms |
6.83 ms |
| BinMD5 |
2.49 ms |
2.32 ms |
2.61 ms |
2.45 ms |
2.27 ms |
2.43 ms |
Test Methods:
SimpleMD5 - Convert string to MD5 hash string using MD5 without raw_output option
foreach ($test_array as $str) {
$tmp[] = md5($str);
}
BinMD5 - Convert string to MD5 hash string using tszming’s method, using raw_output option and use bin2hex() to convert them to hexadecimal.
foreach ($test_array as $str) {
$tmp[] = bin2hex(md5($str, true));
}
Full Source Code:
Show Code |
Download md5test.txt
<?
function microtime_float()
{
return ((float)$usec + (float)$sec);
}
function createRandomAlphanum($len = 8) {
$chars = "abcdefghijkmnopqrstuvwxyz023456789";
$i = 0;
$pass = '' ;
while ($i <= $len) {
$tmp =
substr($chars,
$num,
1);
$pass = $pass . $tmp;
$i++;
}
return $pass;
}
function createRandomString($len = 8) {
$i = 0;
$pass = '' ;
while ($i <= $len) {
$pass = $pass . $tmp;
$i++;
}
return $pass;
}
$max_element = 1000;
// Initialize array, filling random keys and values
for ($i = 0; $i <= $max_element; $i++) {
$test_array[$i] = createRandomString(1000);
}
function SimpleMD5 () {
foreach ($test_array as $str) {
}
return $tmp;
}
function BinMD5 () {
foreach ($test_array as $str) {
}
return $tmp;
}
'SimpleMD5', 'BinMD5',
);
$test_times = 5;
foreach ($tests as $test) {
// Foreach test
for ($a=1; $a<=$test_times; $a++) {
$timestart = microtime_float();
$time_took = microtime_float() - $timestart;
$test_score[$test][] = $time_took*1000;
}
}
// Makesure results match
for ($a=1; $a<=$test_times; $a++) {
foreach ($results['SimpleMD5'][$a] as $k=>$val) {
echo $val .
" = " .
$results['BinMD5'][$a][$k] .
" : " .
($val==
$results['BinMD5'][$a][$k]) .
"<br>";
}
}
?>
<table cellpadding=4 border=0 cellspacing=2>
<tr>
<th> </th>
<? for ($a=1; $a<=$test_times; $a++) { ?>
<th>Test <?=$a; ?></th>
<? } ?>
<th>Average</th>
</tr>
<? foreach ($tests as $test) { ?>
<tr>
<td><?=$test; ?></td>
<? foreach ($test_score[$test] as $score) { ?>
<? } ?>
</tr>
<? } ?>
</table>
Note: Test enviroment is PHP5 + Windows
